中国海洋工程(英文版)
中國海洋工程(英文版)
중국해양공정(영문판)
CHINA OCEAN ENGINEERING
2014年
3期
391-400
,共10页
蒯小燕%孙海信%齐洁%程恩%许小卡%郭瑜辉%陈友淦
蒯小燕%孫海信%齊潔%程恩%許小卡%郭瑜輝%陳友淦
괴소연%손해신%제길%정은%허소잡%곽유휘%진우감
adaptive modulation%OFDM%CSI feedback%compressed sensing%channel prediction%underwater acoustic channels
In this paper, we investigate the performance of adaptive modulation (AM) orthogonal frequency division multiplexing (OFDM) system in underwater acoustic (UWA) communications. The aim is to solve the problem of large feedback overhead for channel state information (CSI) in every subcarrier. A novel CSI feedback scheme is proposed based on the theory of compressed sensing (CS). We propose a feedback from the receiver that only feedback the sparse channel parameters. Additionally, prediction of the channel state is proposed every several symbols to realize the AM in practice. We describe a linear channel prediction algorithm which is used in adaptive transmission. This system has been tested in the real underwater acoustic channel. The linear channel prediction makes the AM transmission techniques more feasible for acoustic channel communications. The simulation and experiment show that significant improvements can be obtained both in bit error rate (BER) and throughput in the AM scheme compared with the fixed Quadrature Phase Shift Keying (QPSK) modulation scheme. Moreover, the performance with standard CS outperforms the Discrete Cosine Transform (DCT) method.